1. Duval County LID Design Manual
2012 ENVIRONMENTAL SYMPOSIUM
August 18, 2012

2. St Johns River Nutrient BMAP
Commitments
One Metric Ton
Requires the City to Reduce Metric Tons of Nitrogen to the River.
Reductions need to be completed by 2023.
Completed 50% reduction required by 2015.
If the City does not meet allocations penalties include per FS , , :
Judicial or Administrative Consent Order
Fines up to $10,000 per day
Growth Moratorium

3. Subdivision Standards Policy Advisory Committee (SSPAC)
SSPAC LID Subcommittee
Incorporate into Land Development Procedures Manual (Redbook)
LID Manual for Duval County

4. LID Manual Consensus – Involve key stakeholders
Guide for including LID in stormwater permitting (State and City)
Voluntary – Alternative to traditional stormwater best management practices

5. Inadequacy of Conventional BMPs
Source: Evaluation of Current
Stormwater Design
Criteria within the
State of Florida
(Harper and Baker, 2007)

6. Duval County LID Manual
City Objectives
Promote LID in the right of way
LID Design Standards
Sustainable Development
ERP Recognition
Developer acceptance
Duval County LID Manual
Many manuals aimed at general public
Lack of permitting/crediting guidelines for stormwater designers
Multiple stakeholders
Aimed at Design Professionals
“To complement ongoing efforts to address localized flooding and reduce the nutrient load entering surface waters, the LID Subcommittee has been tasked, by the SSPAC, with identifying and incorporating LID design criteria into the City of Jacksonville Land Development Procedures Manual (LDPM)., City Standard Specifications, and City Standard Details as appropriate.”

7. Starting Point

8. Potential Practices

9. Selected LID Practices
Shallow Bioretention
Inverted Medians
Bioretention Swales
Curb Extensions
Pervious Pavement
On-street parking
Conveyance Swales

10. Shallow Bioretention
Partial Treatment
Seasonal High Water Table

11. Pervious Pavement Retention Credit
Used for street parking / road shoulders
SHWT limitation
Walks and paths

12. Conveyance Swales SJRWMD & Draft Statewide Applicant’s Handbook
Recognized volume reductions
Sarasota County study - high concentration reductions
Partial treatment

13. Conveyance Swales SJRWMD ERP Requirements
Percolate either 80% or 100% of the 3-year/1-hour storm.
Percolate all standing water within 72 hours.
Top width-to-depth ratio of 6:1 or side slopes > 3:1.
Lateral saturated infiltration must not occur.

14. Proposed Approach
Continuous simulation using EPA-SWMM LID swale object
Multiple soil types, side slopes, bottom widths, and ‘densities’
Design Aids/ Performance Charts
EXAMPLE
DO NOT USE

15. Site Evaluation and Planning
Manual Outline
Overview
Site Evaluation and Planning
LID Practices
Design Examples

16. Practice Information Overview Design Considerations & Requirements
One page table summary of practice
Overview
Sizing
Discharge & recovery requirements
Water quality / water quantity credits
Design Considerations & Requirements
Design steps
Example calculations
Standard details
Design Procedure
Maintenance
Inspection
Testing
Operation and Maintenance

17. Project Schedule Jan 2012 – Report Initial Findings
Mar 2012 – Proposed LID Practices
May 2012 – Revisions to Proposed LID Practices
Jul 2012 – Draft LID Manual Review Meeting 1
Sep 2012 – Draft LID Manual Review Meeting 2
Nov 2012 – Draft LID Manual Review Meeting 3
Jan 2013 – Presentation to Full SSPAC

18. Feedback

19. SSPAC / LID Subcommittee
Acknowledgements
Jones Edmunds
CDM-Smith
R-A-M Professional Group
Dr. Marty Wanielista
Consultant Team
You?
SSPAC / LID Subcommittee

20. Questions